1 / 18

New Developments in VISUM

2008 PTV America Users Group Meeting. New Developments in VISUM. Klaus Nökel, PTV AG, Karlsruhe. What‘s new ?. Procedures ( EVA demand model, PrT assignment ) Data model User Interface (network editor, graphics, listings) Scripting Interfaces ( VISUM / VISSIM integration )

gautam
Télécharger la présentation

New Developments in VISUM

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. 2008 PTV America Users Group Meeting New Developments in VISUM Klaus Nökel, PTV AG, Karlsruhe

  2. What‘s new ? • Procedures (EVA demand model,PrT assignment) • Data model • User Interface (network editor, graphics, listings) • Scripting • Interfaces (VISUM / VISSIM integration) • System Issues (64-bit support) • Perspectives

  3. All highway assignments • Improved performance due to: • Results stored as double precision numbers  better convergence • more intelligent smoothing • faster calculation of commonality factor in stochastic assignment (PS-Logit as an alternative to C-Logit) • faster shortest-path search in very large networks • more intelligent control over inner iterations • Also useful: • Trace of net objects / OD pairs which violate termination criteria • Assignment can be terminated interactively without losing results • HCM intersection capacity analysis re-implemented from scratch, replaces TRAFFIX !!

  4. User-defined volume-delay functions • Why? • Specific functional forms required in some projects • separate functions for transport systems • include network attributes like gradient, hgv share, … • How? • Fast evaluation requires compiled, not interpreted approach • VISUM comes with C++ source code template for DLL • Users can fill in their formulae • Compile the source code to a DLL, name it VISUMVDFxxx.DLL • Drop DLL into VISUM project directory • VISUM scans for DLLs on start-up and lists user-defined functional forms along with others

  5. EVA Demand Model in VISUM • What is EVA? • Demand model covering first three steps • Traditional trip generation using cross-classification • Simultaneous trip distribution and mode choice • Trip balancing conserves flow across trip purposes • More sophisticated utility functions than in VISUM‘s trip-interchange model • Is EVA new? • No, developed since the 1990s at TU Dresden, Germany • Has existed for many years as VISEVA companion product to VISUM. • Now fully integrated into VISUM: • structural + demographic data are zone attributes • all matrix objects (skims + OD) live directly in VISUM • all editing + visualisation capabilities apply to VISEVA data, too

  6. Multi-Edit Intersect available as an operation

  7. MainNodes, MainTurns … finally! • were added to the data model (only) in VISUM 9.5 • from VISUM 10 they are fully functional in: • all assignments and skimming operations ; • assignment path listings ; • flow bundles; • shortest-path search ; • isochrones; • NEMA signal control; • HCM node impedance calculation; • signal optimization; • difference network; • route import; • multi-user editing 4 leg main node

  8. COM scripting • Skim matrices: create and associate with demand segment • Read/write access to interactive marking • Display attribute selection dialog • All container objects: GetAll optionally returns active objects only • Read access to the file name of currently loaded .ver or .net file • Read/write access to all properties of user-defined attributes

  9. Interfaces • VISUM  VISSIM • Interface completely redesigned • Intelligently merges VISUM changes into previously exported VISSIM networks ! • Shapefile import / export • Read also: PolyLineM/Z, PointM/Z • Read/write network file • pre-set options for typical use cases (surfaces, timetable, …) • Demand file • now possible to read in additive mode (useful for complex demand model structures)

  10. File I/O • Project directories • Security tightening in recent Windows releases  no longer allowed to write to EXE directory  several VISUM standard files need to relocate • Windows Vista (where USER is your personal user account): • Projections: C:\Program Data\Visum100\Projections • UserVDF-DLLs: C:\Users\USER\AppData\Roaming\Visum\100\UserVDF-DLLs • Log-Dateien: C:\Users\USER\AppData\Roaming\Visum\log • Windows XP: • Projections: C:\Documents and Settings\Visuminst\ApplicationData\Visum100\Projections • UserVDF-DLLs: C:\Documents and Settings\AllUsers\ApplicationData\Visum\100\UserVDF-DLLs • Log-Dateien: C:\Documents and Settings\AllUsers\ApplicationData\Visum\log • New menu shortcut brings up ERROR and TRACE files

  11. System Issues • 64-bit support • VISUM can use more than 3GB of memory • requires Windows Vista 64-bit • bigger models possible • OS compatibility • Unicode and 64-bit features require new Microsoft libraries • Compatible with all current Windows releases • Support discontinued for Windows 95, 98, ME, NT <= 4.0

  12. Ongoing Improvements in VISUM 10 • Many finishing touches improve robustness and ease of use: • ICA released after extended testing phase • Improved turn type assignment: no more „multiple through movements“  • Nested mode choice: automatically adapt logsum scaling parameter • COM: Retrieve long list contents chunk by chunk – no more „out of memory“ • Drawing order within link layer if you turn this on and re-assign standard turn types, ICA will run fine

  13. Ongoing Improvements in VISUM 10 • Many finishing touches improve robustness and ease of use: • Dynamic User Equilibrium (DUE): capacity for out-flow from a link now independent from capacity on in-flow • Legend items for bars, pies, columns display scale  • VISUM Viewer • Service frequency available as skim value in frequency-based assignment • Ctrl-click extends, shrinks MainNodes, MainZones

  14. VISUM 11 Sneak Preview: Smart Map • Floating overview window • displays instantly where you are in the network • zoom and pan directly in smart map • graphics parameters optionally independent from main view  better display at small scale • reflects our trend to make VISUM more GIS-like

  15. VISUM 11 Sneak Preview: Multi-threading • Computationally intense operations speeded up • assignment • skimming • demand model operations • Supports all modern multi-core processors • Examples • Lohse equilibrium assignment on two cores ~ 60% of sequential runtime • Timetable-based assignment on eight cores 4 – 6 times faster (see right for KA.ver performance)

  16. VISUM 11 Sneak Preview: New node editor • Replaces Edit Node and Edit Turn dialogs • Schematic graphical representation of node, optimized for different aspects of junction model • In-place editing (in schematic) of many properties • Graphical signal timing editor (for signal-group based and phase-based controls)

  17. VISUM 11 Sneak Preview: More Perspectives • VISUM for Traffic Engineering: • Better Node dialog with all intersection data • Signal Optimization (incl. offset coordination in networks) • Versatile PrT path object • Editable PrT assignment results • Node impedance model for roundabouts • Integrated activity/tour-based demand model VISEM • Improved Matrix Estimation (TFlowFuzzy) • Improved PuT Line Blocking (Vehicle Scheduling) • More import filters for foreign data formats, including Cube, TransCAD, Google Transit

  18. ANM REF INP VER ANM + + ... edit ... ANM REF INP ... edit ... + + ANM DIFF VER ANM MERGE ANM REF INP + + VISUM  VISSIM: a new division of labour

More Related